'use strict'

exports.__esModule = true

var _dom = require('./dom')

function _classCallCheck (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function') } }

var Transition = (function () {
  function Transition () {
    _classCallCheck(this, Transition)
  }

  Transition.prototype.beforeEnter = function beforeEnter (el) {
    (0, _dom.addClass)(el, 'collapse-transition')
    if (!el.dataset) el.dataset = {}

    el.dataset.oldPaddingTop = el.style.paddingTop
    el.dataset.oldPaddingBottom = el.style.paddingBottom

    el.style.height = '0'
    el.style.paddingTop = 0
    el.style.paddingBottom = 0
  }

  Transition.prototype.enter = function enter (el) {
    el.dataset.oldOverflow = el.style.overflow
    if (el.scrollHeight !== 0) {
      el.style.height = el.scrollHeight + 'px'
      el.style.paddingTop = el.dataset.oldPaddingTop
      el.style.paddingBottom = el.dataset.oldPaddingBottom
    } else {
      el.style.height = ''
      el.style.paddingTop = el.dataset.oldPaddingTop
      el.style.paddingBottom = el.dataset.oldPaddingBottom
    }

    el.style.overflow = 'hidden'
  }

  Transition.prototype.afterEnter = function afterEnter (el) {
    // for safari: remove class then reset height is necessary
    (0, _dom.removeClass)(el, 'collapse-transition')
    el.style.height = ''
    el.style.overflow = el.dataset.oldOverflow
  }

  Transition.prototype.beforeLeave = function beforeLeave (el) {
    if (!el.dataset) el.dataset = {}
    el.dataset.oldPaddingTop = el.style.paddingTop
    el.dataset.oldPaddingBottom = el.style.paddingBottom
    el.dataset.oldOverflow = el.style.overflow

    el.style.height = el.scrollHeight + 'px'
    el.style.overflow = 'hidden'
  }

  Transition.prototype.leave = function leave (el) {
    if (el.scrollHeight !== 0) {
      // for safari: add class after set height, or it will jump to zero height suddenly, weired
      (0, _dom.addClass)(el, 'collapse-transition')
      el.style.height = 0
      el.style.paddingTop = 0
      el.style.paddingBottom = 0
    }
  }

  Transition.prototype.afterLeave = function afterLeave (el) {
    (0, _dom.removeClass)(el, 'collapse-transition')
    el.style.height = ''
    el.style.overflow = el.dataset.oldOverflow
    el.style.paddingTop = el.dataset.oldPaddingTop
    el.style.paddingBottom = el.dataset.oldPaddingBottom
  }

  return Transition
}())

exports.default = {
  name: 'CollapseTransition',
  functional: true,
  render: function render (h, _ref) {
    var children = _ref.children

    var data = {
      on: new Transition()
    }

    return h('transition', data, children)
  }
}
